Method of and means for making plaster boards



Feb. 3, 1925.

H. A. CUMFER METHOD OF AND MEANS FOR MAKING PLASTER BOARDS 1921 2 Shoots-Sheet 1 Original Filed Sept.

Feb. 3, 1925. 1,525,071

H. A. CUMFER METHOD OF AND MEANS FOR MAKING PLA STER BOARDS Original Filed Sept. 1921 2 Shoots-Sheet 2 java; 11%;"

f2 (ism/) Patented Feb. 3, 1925.

UNITED STATES PATENT OFFICE.

HARRY A. CUEFER, OF CHICAGO, ILLINOIS, ASSIGNOR OF O'NEHALF TO ALBERT D. STEWART, OF HUTCHINSON, KANSAS.

METHOD OF AND MEANS FOR MAKING PLASTER BOARDS.

Application filed September 80, 1921, Serial No. 504,289. Renewed December 18, 1928.

To all whom it may concern:

Be it known that I, HARRY A. CUMFER, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Methods of and Means for Making Plaster Boards, of which the following is a specification.

This invention relates to a method of and means for making plaster boards.

One of the objects of the invention is the provision of a method and means for making plaster board in an unbroken, elongated sheet, while the sheet is continuously moving, and Winding the finished product on a reel or dividing it into suitable lengths for ready shipment, the entire act being performed without stopping the movement of the product while being produced.

Another object is to improve machines for making plaster boards.

Other, further and more specific ob ects and advantages of the invention will become readily apparent, to persons skilled in the art, from a consideration of the following description when taken in conjunction with the drawings, wherein 1 Fig. 1 is a side elevation of the machine.

Fig. 2 is a plan view, showing parts broken away, in section.

Fig. 3 is an enlarged detail of the corrugating apparatus.

Flg. 4 is an isometric perspective view of the product.

In all the views the same reference-characters are employed to indicate similar parts.

The machine as shown is more or less diagrammatic inwhich some of the well known features for performin particular functions are not detailed, as or example, means for printing the name of the manufacturer, trade-mark, etc., upon the strip by an ink roller, or otherwise, may be varied, and also the means for punching the holes at suitable intervals in the upper corrugated strip constituting part of a board, may be varied to suit. other features of structure and operation.

The machine, in general, consists of two side frame members 5 and 6. held together by transverse webs 7, 8 and 9, or otherwise. 7

Rising from each of the frame members,

5 and 6, are standardsIO and 10 for supporting rolls 12 and 13. These rolls are mounted upon shafts 14 and 15, respectively, that have bearings in standards 10 and 10'. The roll 13 is corrugated, as at 16, having depressions and intervening teeth 17. A like corrugated roll. 18 is mounted upon the shaft 19 which is provided with bearings supported by the frame members 5 and 6, and a roll 20, a companion to the roll 12, is mounted upon the shaft 21. Betweenthe .rolls 12 and 13 is a pair of endless belts 22 and 22. The links of these belts are connected together by bars 23, that are substantially rectangular in cross section, and conform in shape to the corrugating de ressions 16 in the rolls 13 and 18. The are extend transversely of the bed of the machine and are connected together b links 22 and 22' constituting portions 0 the chains that join the bars in a continuous unbroken belt at each end of the bars. The roll 13 is driven by an electric motor 25 thru a train of gears 26. The same motor drives a punching press 27,

by belt or chain 28, and also drives thepaper rolls 29 and 30 by the chain 31. The shaft 32 upon which the roll 30 is mounted contains apulley surrounded by a belt 33 that drives the printing instrumentality 34.

The plaster board is made in part of a coated water-proof sheet of felt, 35, which is contained upon the roll 29 and which I passes over a roller 36 into a tank 37 containing asphaltum 38, or the like, below roller 39, and from thence between the doctors or scrapers 40 and 41, which are used to remove the excessive amount of the asphalt that may adhere to the sheet. The sheet then passes over the roll 20. The sheet just described consists of a coated sheet or strip vby the operation of the transverse bars 23 that enter the depressions 16' separated by the intermediate projections 17, as more clearly shown in Fig.3. The bars. 23 then remain in the ooves or depressions in the sheet 42, until the base portionsthereof are brought into contact with the moving coated sheet 35, containing the hot adhesive asphalt. The asphalt sheet is therefore thus cemented to the under base surfaces 48 of the corrugated ortion of the sheet 42, leaving the upstan 'ng perforated portions 49 between the base portions 48. The portions 49 are perforated, as more clearly shown in Fig. 4, through which perforations the plaster, to be applied to a wall upon which the laster board is to be fixed, will be keye The corrugations 47 extend transversely of the sheet constituting the plaster board, and when nails are passed thru the base part 48,the plaster filled ribs 49, formed by the corrugations extend between studs of a building and this renders the plaster board rigid and substantially unyielding; at the same time when the board is deflected from a longitudinal path it is suflicientl flexible to be wound into rolls, upon a ree After the sheet leaves the rolls 12 and 20 it passes over a water table 50 thru which cold water 51 is caused to circulate.- The table is provided with baflie plates 52 which cause the water to circulate, the water entering at an opening 53 and passing out thru a similar opening 54. The required length of the water table will depend upon' the speed of the travelling product and the temperature to which is desired that it shall be cooled. Before the sheet passes on to the water table, however, it is first covered with powdered mica, talc, soap stone, or the like, so as to render it iess adhesive to the surface of the table. A receptacle 63 is provided to receive a supply of such owdered material which is thrown upon t e under surface of the sheet 35 by the rotating duster 64. A conveyor 65 causes the receptacle 63 to be. supplied with the required material. The dusting device is mounted upon the shaft 66 driven by the conveyor shaft 67 by a belt 68,.the conveyor shaft bein driven by the motor 25 thru a belt or chain 69. I

A device indicated by a roller 70 may constitute a means for measuring the length of the material passing on to the driven roll 71 and a knife 72 operated by any suitable means, initiated by the operation of the measuring device, may be employed for cutting the product 61 into suitable lengths for shipment, or the product may be wound into the roll 71 when more convenient for transportation.

As soon as the corrugations are made in the sheet 42 the transverse bars 23 hold the sheet in corrugated sha until adjacent corrugations are cemente together by the underlying waterproof sheet 35.

sheet of absorbent material -with The hand wheels 62 may be employed to raise and lower the rollers 12 and 13 suitable to the thickness of the sheets 35 and 42.

In carrying my invention into effect the bonding perforated sheet 42 is first corrugated, then held in corrugated position until the base portions 48 oft-he corrugations are cemented to he underlying waterproof sheet 35 coated with hot asphalt. The sheets are then passed over a cooling table to cool the hot asphalt and to cause the sheets to adhere, then the product is wound into rolls or cut into suitable lengths. When the plaster board has passed over .the water table the asphaltum with which the sheet 35 is coated has thus been cooled and when cooled it thoroughly cements the overlying corrugated sheet to the straight underlying waterproof sheet 35, the outstanding corrugations being perforated, the plaster will enter the closed rib thus formed.

While I have herein referred to the product as plaster board, for brevity, it will be understood that plaster receiving board is probably a more specific but more extended definition, and while I have specified asphaltum as the coating and adhesive medium, any equivalent thereof will come within the scope of the invention.

Having described my invention what I claim-as new and desire'to secure by Letters Patent, is 4 1. The, method of making plaster board which consists in making transversely extending groups of holes thru a sheet at suitable longitudinal intervals; forming the sheet into corrugations in which the perforated portions form the crests; coating1 a ct asphaltum pressing the base of the corrugations into contact with the underlying coated sheet, and cooling the underlying sheet to cause adherence thereof with the corrugated sheet.

2. The method of making plaster board which consists in making transversely extending groups of holes thru a sheet at suitable longitudinal intervals; forming the sheet into corrugations in which the perforated portions form the crests; coating a sheet of absorbent felt with hot asphaltum; pressing the base of the corrugations into contact with the underlying coated, sheet; cooling the underlying sheet to cause adherence thereof with the corrugated sheet and continuously moving both sheets of which the board is made.

3. A machine for making plasterboard comprising means for making a series of suitably spaced apart transversely extending perforations in a continuously moving sheet,

providi transversely extending bars insertable 1n said corru ations in consecutive order; another pair 0 rolls between which the belt passes; means for coating an uncorrugated sheet for cementing attachment with the base portions of the corrugated sheet, both said sheets passing between the last mentioned air of rolls, whereby the under roll and t e transverse superimposed bar press the two sheets together; a water table to cool the coated sheet and means to continuously move both sheets.

4. A machine of the character described having two corrugating rolls driven in timed relation and havin projections in register with each other an intervening depressions in register with each other; a continuous chain having a series of parallel bars received in the depressions of one roll and which enter the depressions of the other roll,

as the rolls are rotated, to eorrugate an intervening sheet,v and another 'pair of spaced-apart rolls to support the chain.

5. .A machine of the character described having two corrugating rolls driven in timed relation and having projections in register a with each other and intervening depressionsin register with each other; a continuous chain having a series of parallel bars received in the depressions of one roll and which enter the depressions of the other roll as the rolls are rotated to corrugate an intervening sheet; another air of spaced-apart rolls to support the c ain; means to coat another sheet and means for cementing the coated sheet to the base portions of the corrugations as the sheets pass between the last pair of rolls.

6. A machine of the character described comprising a pair of corrugating rolls for corrugating a moving sheet; driving means adjacent each opencorrugation of the sheet; means to saturate another sheet with hot water-proofing cementitious material; means to cement the sheets together to close alternate corrugations and means to cool the saturated sheet.

- 7. A machine of the character described comprising a pair of oorrugating rolls; for corrugating a moving sheet; means for driving the sheet and the rolls; driven means to hold the corrugations in place after they have left the rolls; means to drive another sheet in a path parallel with the movement of the corrugated sheet and means for cementing the sheets together before the corrugations leave the corrugation holding means. Y

8. A machine of the character described comprising 'a pair of corrugating rolls; a chain havin bars to enter the respective corrugations o a strip and to move therewith after the strip to be corrugated has left the rolls; another pair of spaced away rolls between which the strip and chain pass, and means to cement another strip to the corrugated strip before the strip leaves the last pair of rolls.

9. A machine of the character described comprising a pair of corrugating. rolls for corrugating a moving strip; drlven means to hold. the corrugations in place after they leave the rolls and to assist in driving the strip and means to attach another strip to the corrugated strip before the corrugation are released by the holding means.

In testimony whereof I hereunto subscribe my name.

HARRY A CUMFER. 

